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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612c1f5fe25dd25f97b8051250792e7475d8d03fe4d152e356ad6f14409a6df3' 
  AND token = 'OMQhiPk6eKb5cbsNuOYX6ZyTI59ZHOSrhF09Q5a4Z24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}